[RFC v4 24/25] drm/client: Hack: Add bootsplash

["Noralf Trønnes" <noralf@tronnes.org>]

A hack to test the client API.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
 drivers/gpu/drm/Kconfig                 |   2 +
 drivers/gpu/drm/Makefile                |   1 +
 drivers/gpu/drm/client/Kconfig          |   9 ++
 drivers/gpu/drm/client/drm_bootsplash.c | 248 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/client/internal.h       |  19 +++
 drivers/gpu/drm/drm_client.c            |   4 +
 6 files changed, 283 insertions(+)
 create mode 100644 drivers/gpu/drm/client/Kconfig
 create mode 100644 drivers/gpu/drm/client/drm_bootsplash.c
 create mode 100644 drivers/gpu/drm/client/internal.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 757825ac60df..1328202ce17d 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -154,6 +154,8 @@ config DRM_SCHED
 	tristate
 	depends on DRM
 
+source "drivers/gpu/drm/client/Kconfig"
+
 source "drivers/gpu/drm/i2c/Kconfig"
 
 source "drivers/gpu/drm/arm/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index d25afa136d8f..388527093f80 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -30,6 +30,7 @@ drm-$(CONFIG_OF) += drm_of.o
 drm-$(CONFIG_AGP) += drm_agpsupport.o
 drm-$(CONFIG_DEBUG_FS) += drm_debugfs.o drm_debugfs_crc.o
 drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
+drm-$(CONFIG_DRM_CLIENT_BOOTSPLASH) += client/drm_bootsplash.o
 
 drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
 		drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
diff --git a/drivers/gpu/drm/client/Kconfig b/drivers/gpu/drm/client/Kconfig
new file mode 100644
index 000000000000..6b01f2e51fb3
--- /dev/null
+++ b/drivers/gpu/drm/client/Kconfig
@@ -0,0 +1,9 @@
+menu "DRM Clients"
+	depends on DRM
+
+config DRM_CLIENT_BOOTSPLASH
+	bool "DRM Bootsplash"
+	help
+	  DRM Bootsplash
+
+endmenu
diff --git a/drivers/gpu/drm/client/drm_bootsplash.c b/drivers/gpu/drm/client/drm_bootsplash.c
new file mode 100644
index 000000000000..bec3105f9b02
--- /dev/null
+++ b/drivers/gpu/drm/client/drm_bootsplash.c
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/keyboard.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#include <drm/drm_client.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_print.h>
+
+// drm_lastclose()
+#include <drm/drmP.h>
+#include "drm_internal.h"
+
+static bool drm_bootsplash_enabled = true;
+module_param_named(bootsplash_enabled, drm_bootsplash_enabled, bool, 0600);
+MODULE_PARM_DESC(bootsplash_enabled, "Enable bootsplash client [default=true]");
+
+struct drm_bootsplash {
+	struct drm_client_dev *client;
+	struct drm_client_display *display;
+	struct drm_client_buffer *buffer[2];
+	struct work_struct worker;
+	bool stop;
+};
+
+static bool drm_bootsplash_key_pressed;
+
+static int drm_bootsplash_keyboard_notifier_call(struct notifier_block *blk,
+				  unsigned long code, void *_param)
+{
+	/* Any key is good */
+	drm_bootsplash_key_pressed = true;
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block drm_bootsplash_keyboard_notifier_block = {
+	.notifier_call = drm_bootsplash_keyboard_notifier_call,
+};
+
+static u32 drm_bootsplash_color_table[3] = {
+	0x00ff0000, 0x0000ff00, 0x000000ff,
+};
+
+/* Draw a box with changing colors */
+static void
+drm_bootsplash_draw(struct drm_client_buffer *buffer, unsigned int sequence)
+{
+	unsigned int x, y;
+	u32 *pix;
+
+	pix = buffer->vaddr;
+	pix += ((buffer->height / 2) - 50) * buffer->width;
+	pix += (buffer->width / 2) - 50;
+
+	for (y = 0; y < 100; y++) {
+		for (x = 0; x < 100; x++)
+			*pix++ = drm_bootsplash_color_table[sequence];
+		pix += buffer->width - 100;
+	}
+}
+
+static void drm_bootsplash_worker(struct work_struct *work)
+{
+	struct drm_bootsplash *splash = container_of(work, struct drm_bootsplash, worker);
+	struct drm_device *dev = splash->client->dev;
+	unsigned int i = 0, sequence = 0;
+	struct drm_framebuffer *fb;
+	int ret = 0;
+
+	while (!splash->stop && !drm_bootsplash_key_pressed) {
+		/* Did someone take over, like another in-kernel client, except fbdev? */
+		fb = drm_client_display_current_fb(splash->display);
+		if (splash->buffer[i]->fb != fb &&
+		    !(dev->fb_helper && dev->fb_helper->fb == fb))
+			break;
+
+		i = !i;
+		drm_bootsplash_draw(splash->buffer[i], sequence++);
+		if (sequence == 3)
+			sequence = 0;
+
+		ret = drm_client_display_commit(splash->display, splash->buffer[i]->fb, NULL);
+		/* Is userspace in charge or is the device unplugged? */
+		if (ret == -EBUSY || ret == -ENODEV)
+			break;
+
+		msleep(500);
+	}
+
+	/* Restore fbdev (or other) on key press. */
+	/* TODO: Check if it's OK to call drm_lastclose here. */
+	if (drm_bootsplash_key_pressed)
+		drm_lastclose(dev);
+
+	for (i = 0; i < 2; i++)
+		drm_client_framebuffer_delete(splash->buffer[i]);
+	drm_client_display_free(splash->display);
+	drm_client_remove_defer(splash->client);
+	DRM_DEV_DEBUG_KMS(dev->dev, "Bootsplash has stopped (key=%u stop=%u ret=%d).\n",
+			  drm_bootsplash_key_pressed, splash->stop, ret);
+}
+
+static int drm_bootsplash_setup(struct drm_bootsplash *splash)
+{
+	struct drm_client_dev *client = splash->client;
+	struct drm_client_buffer *buffer[2];
+	struct drm_client_display *display;
+	int ret, i;
+
+	display = drm_client_find_display(client->dev, 0, 0);
+	if (IS_ERR(display))
+		return PTR_ERR(display);
+	if (!display)
+		return -ENOENT;
+
+	if (WARN_ON(!display->mode))
+		return -ENOENT;
+
+	for (i = 0; i < 2; i++) {
+		buffer[i] = drm_client_framebuffer_create(client, display->mode,
+							  DRM_FORMAT_XRGB8888);
+		if (IS_ERR(buffer[i])) {
+			ret = PTR_ERR(buffer[i]);
+			goto err_free_buffer;
+		}
+	}
+
+	ret = drm_client_display_commit(display, buffer[0]->fb, display->mode);
+	if (ret)
+		goto err_free_buffer;
+
+	splash->display = display;
+	splash->buffer[0] = buffer[0];
+	splash->buffer[1] = buffer[1];
+
+	schedule_work(&splash->worker);
+
+	return 0;
+
+err_free_buffer:
+	for (i--; i >= 0; i--)
+		drm_client_framebuffer_delete(buffer[i]);
+	drm_client_display_free(display);
+
+	return ret;
+}
+
+static int drm_bootsplash_client_hotplug(struct drm_client_dev *client)
+{
+	struct drm_bootsplash *splash = client->private;
+	int ret = 0;
+
+	if (splash->display)
+		return 0;
+
+	ret = drm_bootsplash_setup(splash);
+	if (ret) {
+		DRM_DEV_DEBUG_KMS(client->dev->dev, "ret=%d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int drm_bootsplash_client_remove(struct drm_client_dev *client)
+{
+	struct drm_bootsplash *splash = client->private;
+
+	/* Don't hook up to any new devices showing up */
+	drm_bootsplash_enabled = false;
+
+	splash->stop = true;
+	flush_work(&splash->worker);
+	kfree(splash);
+
+	return 0;
+}
+
+static const struct drm_client_funcs drm_bootsplash_client_funcs = {
+	.name		= "bootsplash",
+	.remove		= drm_bootsplash_client_remove,
+	.hotplug	= drm_bootsplash_client_hotplug,
+};
+
+static int drm_bootsplash_dev_notify(struct notifier_block *nb,
+				     unsigned long action, void *data)
+{
+	struct drm_device *dev = data;
+	struct drm_client_dev *client;
+	struct drm_bootsplash *splash;
+
+	if (!drm_bootsplash_enabled)
+		return 0;
+
+	splash = kzalloc(sizeof(*splash), GFP_KERNEL);
+	if (!splash)
+		return 0;
+
+	client = drm_client_new(dev, &drm_bootsplash_client_funcs);
+	if (IS_ERR(client)) {
+		DRM_DEV_ERROR(dev->dev, "Failed to create client, ret=%ld\n", PTR_ERR(client));
+		kfree(splash);
+		return 0;
+	}
+
+	INIT_WORK(&splash->worker, drm_bootsplash_worker);
+
+	splash->client = client;
+	client->private = splash;
+
+	/*
+	 * vc4 isn't done with it's setup when drm_dev_register() is called.
+	 * It should have shouldn't it?
+	 * So to keep it from crashing defer setup to hotplug...
+	 */
+	if (client->dev->mode_config.max_width)
+		drm_bootsplash_client_hotplug(client);
+
+	return 0;
+}
+
+static struct notifier_block drm_bootsplash_dev_notifier = {
+	.notifier_call	= drm_bootsplash_dev_notify,
+};
+
+void drm_bootsplash_register(void)
+{
+	register_keyboard_notifier(&drm_bootsplash_keyboard_notifier_block);
+
+	if (!drm_bootsplash_enabled)
+		return;
+
+	drm_dev_register_notifier(&drm_bootsplash_dev_notifier);
+}
+
+void drm_bootsplash_unregister(void)
+{
+	drm_dev_unregister_notifier(&drm_bootsplash_dev_notifier);
+	unregister_keyboard_notifier(&drm_bootsplash_keyboard_notifier_block);
+}
diff --git a/drivers/gpu/drm/client/internal.h b/drivers/gpu/drm/client/internal.h
new file mode 100644
index 000000000000..22e2120c493b
--- /dev/null
+++ b/drivers/gpu/drm/client/internal.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _DRM_CLIENT_INTERNAL_H_
+#define _DRM_CLIENT_INTERNAL_H_
+
+#ifdef CONFIG_DRM_CLIENT_BOOTSPLASH
+void drm_bootsplash_register(void);
+void drm_bootsplash_unregister(void);
+#else
+static inline void drm_bootsplash_register(void)
+{
+}
+
+static inline void drm_bootsplash_unregister(void)
+{
+}
+#endif
+
+#endif
diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index 760f1795f812..cd8c084c8801 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -24,6 +24,7 @@
 
 #include "drm_crtc_internal.h"
 #include "drm_internal.h"
+#include "client/internal.h"
 
 struct drm_client_display_offset {
 	int x, y;
@@ -234,10 +235,13 @@ EXPORT_SYMBOL(drm_client_remove_defer);
 
 void drm_client_init(void)
 {
+	drm_bootsplash_register();
 }
 
 void drm_client_exit(void)
 {
+	drm_bootsplash_unregister();
+
 	flush_work(&drm_client_remove_defer_work);
 }
 
-- 
2.15.1

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